Sound-reproducing apparatus



Sept. 9 1924.

Filed Oct. 9. 1919 Patented Sept. 9, 1924.

'r QFFICE.

ANTHONY VASSELLI, 0F NEWARK, NE'W JERSEY, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO GENERAL PHONOGRAPH CORPORATION, OF NEW YORK, N. Y., A COR- PORATION OF NEW YORK.

SOUND-REPRODUCING APPARATUS.

Application filed October 9, 1919. Serial No. 329,478.

To all 'whom t .may concern.'

Be it known that 1, ANTHONY VAssELLi, a citizen of the United States, and a resident of the city of Newark, county of Essex, and State of New Jersey, have invented a certain newv and use-ful lmproveinent iii Sound-Reproducing Apparatus, of which the following is a specification.

The object of my invention is to provide improvements in apparatus for reproducing sound; by means of which the quality of the reproduction will be improved.

Further objects of my invention are to provide a sound-box wherein the diaphragm is more sensitive to movements of the stylus caused by the engagement of the latter with the record groove; whereby chattering and blasting will be avoided; and whereby the diaphragm will be caused to assume the neutral position more readily than in prior constructions, especially in reproductions of high notes.

A further object of the invention is to produce a device of the character described, which is extremely simple in construction, neat and attractive in appearance, thoroughly reliable and efficient in its purpose, and inexpensive t0 manufacture.

With these and other objects in view to be more fully set forth hereinafter, the invention consists in the novel construction, coinbination of elements, and arrangement of parts which will be exemplified in the construction hereinafter described in the specification and illustrated Vin the accompanying drawings considered together or separately.

The inventive idea involved is capable of receiving a variety of mechanical expressions, one of which for the purpose of illustrating the invention, is shown in the accompanying drawings.

The invention will be rst described in connection with the` accompanying drawings, wherein similar reference characters are used to designate corresponding parts throughout the several views, and then more specifically dened and indicated in the appended claim.

In the drawings,-

Fig. 1 is a front elevation of a sound-box embodying my invention;

g. 2 is a section on the line 2-2`of l.

tubular extension for attachment to a tonearm, as is common. y To the center of the diaphragm is secured one end of a stylus arm 4 which may be made integral with a stylus holder 5 in which a stylus 6 is secured by the l`usual screw 7.

Depending from the sound-boxl is a pair of spaced ears or lugs 8, each carrying a conical pointed screw 9. Each screw is provided with a lock nut 10. -The screws are in axialv alignment and the conical ends engage in conical sockets in opposite sides of the stylus holder between the stylus and the point of attachment lof the stylus arm with the diaphragm. i Carried by the stylus holder, and extending at right angles to the axial line of the screws 9 is an arm 11. The arm 11 extends under the sound-box 1, and in its free end is a perforation throughv which extends a screw 12 which is secured within a recess 15 in the under side of the sound-box.

Surrounding the screw 12 are two helical springs 13 and 111, one in each side of the arm 11 and bearing on opposite sidesof the arm. One end of the spring 13 bears against the head of the screw 12, andone end of the spring 14 bears against a nut 16 lying in the recess 15, whereby the arm 11 is held normally perpendicular to the plane of the diaphragm, and the latteris normally held in the neutral or central position.

The screw 12 is provided withthreads 17 which engage the threaded perforation vof the nut 16, and has a reduced, threaded extremity 18 which is screwed into a socket in the bottom of the recess 15. provided with a lug 19 which projects through an open-ended slot 20 in the wall ofthe sound-box and acts to prevent rotation of the nut.

The nut is The threads 17 are of twice the pitch of the threads 18, and when, the screw 12 is rotated the nut 16 will be caused to travel along the screw at twice the speed that the screw will travel into or out of its socket. By this construction the springs 13 and 14 are compressed or relaxed to exactly the same extent, as depends on the direction of rotation of the screw.

If the screw be rotated in the clockwise direction the spring 13 will be compressed between the head and the arm l1. As the threads 17 engaging the nut 16 are of twice the pitch of the threads 18, the nut will be drawn downward at twice the speed of the upward movement of the screw, and the spring 14 will be compressed to the same extent as will the spring 13. On the reverse movement, the springs will be simultaneously relaxed and to the same. extent.

lhen the vdiaphragm is flexed by the engagement of the stylus with the record groove, the tendency of one or the other of the springs 13 or 14 is to restore the diaphragm to its normal position. The springs acting on the diaphragm in the axial line of the latter, malte the dipliragm extremely sensitive to movements of the stylus, and as the springs perform no function other than centering the diaphragm, they can be made very light and sensitive.

In accordance with the provisions of the patent statute, I have described the principle of my invention, 'together'` with the apparatus which I now consider toi-epresent the best embodiment thereof, but l desire it understood that my invention is not confined to the particular form of apparatus herein shown and described, the same being merely illustrative, and that the invention can be carried out in other ways witlr out departing from the spirit of my invention, and therefore, I claim broadly the right to employ all equivalent instrumentalities coming Within the scope of the appended claim, and by means of which objects of my invention are attained, and the new results accomplished, as herein set forth, as it is obvious that the particular embodiment herein shown and, described is only one of many that can be employed to attain these objects and accomplish these results.

Having now described my invention, what l claim and desire to secure by Letters Patent is as follows An article of the class described, comprising a sound-box casing, a diaphragm, a stylus arm attached to the diaphragm, a rearward extension on said stylus arm hav-ing a perforation, a bolt passing through the perforation, said bolt being threaded into said casing, a second thread on the bolt, the second thread-having a faster pitch than the first thread, a nut engaging the second thread, an elastic element between the head of the bolt and the extension, and an elastic element between the extension and the nut, whereby the elements will be simultaneously acted on, said casing provided with a slot, and a lug on,v the nut protruding into the slot for preventingrotation of the nut.

This specification signedk this 15th day of September, 1919.

ANTHONY VASSELLI. 

